Roller core bit



Aug. 30, 1932. L. H. WELLENSIEQK 1,874,070

ROLLER CORE BIT Filed March 24, 1931 m 26 f .w

ll l Ah. We/Jezzaz'a INVENTOR BY 3 m A TTORNEY Patented Aug. 30, 1932 UNITED STATES PATENT; OFFICE LOUIS H. WELLENSIEK, OF HOUSTON, TEXAS, ASSIGNOR TO HUGHES TOOL COMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXAS ROLLER CORE IBIT Application filed March 24, 1931. Serial No. 524,790.

ing for the individual cutters, which will enable the cutters to be supported thereon with 1 the cutter shafts formed integrally with the support.

I also have as an object to provide a cutter head which may be mounted upon the drill collar or support without the necessity of a threaded connection therewith.

It is a further object to provide an effective construction whereby the flushing fluid may be conducted directly upon the cutters.

The invention resides particularly in the manner in which the drill cutters are mounted 1 1 of Fig. 4.

Fig. 2 is a perspective view showing the manner of mounting the cutters upon the head of the drill.

Fig. 3 is a perspective view of one of the cutter supports disconnected from the head.

Fig. 4 is a transverse section on a plane 4-4 of Fig. 1.

Fig. 5 is a perspective view of one of the blocks employed in spacing the cutters upon the head and supporting the same in position.

Fig. 6 is a erspective View of one of the locking keys, y means of which the head is ggld in position upon the head of the drill Id the construction of my device, the body of the drill is shown at 5 in Fig. 1 as being of tubular construction, the lower end 6 of which is increased slightly in outer diameter to engage with the upper ends 7 of the cutter supports 9. The lower end of the body 6 is squared oil? to engage the upper ends of the cutter supports and to form a close engagement therewith.

The lower end of the drill body has therein a plurality of recesses spaced apart to receive the tubular pins 11 which are screwed therein. A water channel 12 in the drill body 0 extending downwardly in an inclined direction is adapted to connect with the channel 13 through these pins. As will be seen from Fig. 4, there are six of these pins 11 arranged in sets of two and spaced apart by blocks 14, the'shape of which is shown best in Fig. 5.

The cutter supports 9 are of the construc tion best indicated in Fig. 3. There is an upper rectangular block on each support having a longitudinal opening 15 therein to receive the lower end of the tubular pin 11. The inner side 16 is curved to conform to an inner curvature of the drill body. On the lower side of each block is a shoulder 17 formed to fit over and be supported upon the ilrrill head 18. This will be understood from Below the shoulder 17, the outer side of each block is extended downwardly and formed into a cutter shaft 19 which is in- 0 clined toward the center of the drill and tapered as shown in Fig. 3 to form a bearing for a roller cutter 20. The end of each shaft is formed with a cylindrical portion 21, which may be welded to the cutter head 18 as is shown at 22 in Fig. 1. It is to be understood that each alternate cutter has a shaft in clined at a different angle from that of the inner portion of which is shaped to receive the keys 25. Also, each of the pins 11 secured in the drill body is recessed on its outer side at 27 to receive said keys 25. When the head with the cuttersthereon as shown in Fig. '2 is inserted upwardly against the drill body,

' the openings 15 in the cutter'supports telescope over the tubular pins 11, bringing the recess 27 on the tubular pins into registration with the slotted recess 26 in the cutter supports. The keys 25 may then be forced into said openings or recesses as indicated in Fig. 4, and the ends bent over to hold the keys in position. These keys are tapered from one end to the other as will be understood from Fig. 6, so that when they are forced into position they will move the head 18 firmly into contact with the lower end of the cutter body.

As will be understood from Fig. 2, when the cutter head is thus attached to the drill body, there will be spaces indicated at 29 in Fig. 2 between the upper ends of the cutter supports and the lower end of the cutter body. This space I contemplate filling with blocks shown at 30 in Fig. 1 which are-seated partially in the space between the cutter supports and partially in a recess 31 in the lower end of the cutter body. Upon this block may be mounted a core catcher having cutter dogs '31 thereon, such structure, however, forming no art of the present invention.

n the drawing as seen in Fig. 1, the cutte body 5 is shown as having a core barrel 32 fitted within the lower end thereof, leaving a space 33, through which flushing fluid may find its way to the u per end of water channels 12. Outside o the body is a collar 34 separated from the cutter body by a floating sleeve 35 having packing rings 36 thereon on opposite sides to form a fluid tight engagement between the collar and the cutter body.

It is to be understood, however, that the construction of my cutter head may be varied in various ways, and that the use of a packing ring such as is shown at 35 shows no essential part of the present invention. The urpose of the said invention is to form a seal etween the collar 34 and the cutter body 5.

The advantages of this construction lie in the fact that the cutters may be secured and assembled in position on the drill without difliculty, and that a strong construction is thus obtained. The cutter pins or shafts 19 are formed integrally with the supports 9 and will thus better resist any tendency to be broken ofi from the supports. When the cutters are assembled upon the cutter body 18 as shown in Fig. 2, the inner ends may, if desired, be welded to the head 18 as shown in Fig. 1. By forming a connection between the cutter head and the cutter body throu h the use of tubular pins or shafts as descri d, I

am enabled to avoid the necessity of a threaded connection between the head and the cut ter body. This allows a more sturdy construction and allows the core barrel to be attached at a point closer to the cutters and to provide a core catcher close to the bottom of the hole.

It will be seen that the drill may be quickly mounted in position upon the head of the drill'and also easily removed b driving the keys 25 from their position an slipping the head ofi' from the ends of the pins 11. The further advantages of this construction will be a parent.

hat I claim as new is:

1. A core drill including a tubular body, a drill head, cutter supports on said drill head adapted to abut the lower end of said body, pins on said body adapted to telescope wit in openings in said cutter supports, means to secure said pins to said supports, whereby said head and body are connected together, and cutters on said supports.

2. A core drill including a tubular body, a drill head, cutter supports on said drill head adapted to abut the lower end of said body, pins on said body adapted to telescope within openings in said cutter supports, said' ins being tubular and adapted to convey ushing fluid, means to secure said pins to said supports, whereby said head and bod are connected together, and cutters on sai supports. 1

3. A core drill including a tubular body, a drill head, cutter supports on said drill head adapted to abut the lower end ofsaid bodly, pins on said body adapted to telescope wit in openings in said cutter supports, means to secure said pins to said supports includin keys inserted transversely of said pins an said supports, whereby said head and body are connected together, and cutters on said supports. 1 v

4. In a core drill, a body, a drill head, cutters mounted on said head, upwardly extending blocks thereon, removable downwardly projecting pins on said body engaging in said blocks, and transverse keys in said head engaging said pins to retain said head on said 5. A core drill body, a head connected therewith, cutter supports including blocks mounted rigidly on said head, cutters on said supports, and means on-said body engaging said blocs to secure said head to said body.

6. A core drill head includingaringshaped member, a plurality of pairs of cutter blocks fitting against and ada ted'to be welded to said ring, each of said locks havin an inclined cutter shaft integral therewith, and cutters mounted on said shafts.

7. In a core drill, a tubular bod a rin shaped head, cutter supports fixe to sai head, said supports having recesses therein, pins projecting downwardly from said body and adapted to fit within said recesses, means to secure said pins to said supports and cut- 8. In a core drill, a tubular body, a rin shaped head, cutter supports fixed to sai head, said supports having recesses therein, pins projecting downwardly from said body and adapted to fit within said recesses, means to secure said pins to said supports and cutters on said supports, said pins being tubular and adapted to conduct flushing fluid to said cutters.

9. A core drill including a tubular bod a ring shaped head, cutter supports welde in position on said head, cutters on said supports, pins detachably connected with said ody and adapted to project into recesses 1n said supports, and means to latch said pins in said head In testimony whereof, I hereunto 'aflix my signature, this the 2 da of March A. 1)., 1931.

LOUIS WELLENSIEK. 

